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H(e,e’p) Analysis. Chris Crawford Blast Analysis Meeting 2004/05/21. Monte Carlo Dataset. used DGen, epel channel KINE 10 1. 1. 0. 45. 0. 21. 0. 11. (note .’s) 4 states, q =25 ±  90 ± , f =-17 ±  17 ± gen. 2.5M events ! 1.5M recon (75 bud hrs) momentum resolution: 15 MeV

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H e e p analysis

H(e,e’p) Analysis

Chris Crawford

Blast Analysis Meeting

2004/05/21


Monte carlo dataset
Monte Carlo Dataset

  • used DGen, epel channel

    • KINE 10 1. 1. 0. 45. 0. 21. 0. 11. (note .’s)

    • 4 states, q=25±  90±, f=-17±  17±

    • gen. 2.5M events ! 1.5M recon (75 bud hrs)

  • momentum resolution: 15 MeV

    • 6th order t2d function (before 2ndq bug-fix)

    • standard wire resolution (200!120!400 m)

    • LOSS=1 MULS=1





Fit method

Super-ratio Method

2 equations in P, R

for fixed bin j

independent polarization in each bin!

2n parameters Pj, Rj

Global Fit Method

fit ALj, ARj to above formalism with P, Rj

n+1 parameters

n+2 (+spin angle?)

same advantage as super-ratio method

PbPt still cancels

i = left,right

j = Q2 bin (1..n)

b = spin angle

Fit Method





Fit of spin angle
Fit of Spin Angle

  • Spin angle: 35±§ 10±(errors also insensitive?)


Systematic errors
Systematic Errors

  • 4 measured states ) 2 False Asymmetries

  • Two options:

    • a) assume beam and target symmetric, use Ab, At to estimate uncertainty in charge

    • b) use measured beam/target asymmetryto calculation physics asymmetry dilution



Mc resolution studies
MC Resolution Studies

intrinsic wire resolution

Momentum Resolution (MeV)



Tools for improving reconstruction analysis

wcb_ntuple.C

entry for each stub

track info (p,q,f,z)

stub coordinates

t0-2, x0-2, d0-2

qtrk in cell, B field

Tools for Improving Reconstruction/Analysis




Todo list
Todo List

  • refine cuts (TOF, CC), subtract background

  • cuts on epics variables (current, WC HV)

  • detector efficiencies w/unpol buffer system

  • more statistics in MC, radiative corrections

  • unfold b(z), acceptance dependence of s

  • improve WC resolution, do a kinematic fit

  • investigate low value of b fit


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